Inclined u water tube boiler



P 25, 1951 A. A. DRAGO ET AL INCLINED "11'! WATER TUBE BOILER 2 Sheets-Sheet 1 Filed Dec. 4, 1947 FIG].

INVENTORS GEORGE H. BRAOE ALFWED A. DRAG'O BY M ATTORNEY p 1951 A. A. DRAGO ET AL INCLINED "u" WATER TUBE BOILER 2 Sheets-Sheet 2 Filed Dec. 4, 1947 FIG. 2.

INVENTORS' GEORGE H. BRAGE ALFRED A. DRAGO v ATTORNEY Patented Sept. 25, 1951 INCLINED U WATER'TUBE BOIIiER Alfred A. Drago and George H. Brace, NewLondon, Conn.

Application i December 4, 194?, Serial N 0.7S9,640

The invention relates to improvements insteam generators and water heaters in which water .circulates through the medium of tubes, and-the tubes exposed to flames and hot gases forthe purpose of heating the water .and/or generating steam.

The invention is illustrated in the accompanying drawings, in which Fig. 1 is a cross-sectional view taken vertically through the boiler. Fig. 2 is a perspective view of the boiler, as it appears after the removal of the casing and fire box.

The fire box is of welded steel construction. A burner is indicated at 4. The fire box lining I consists of a high temperature refractory cement or its equal, held in position by anchors welded to the steel base.

The main part of the boiler 6 consists of two steel plates rolled to form a triangular framework connecting to a steam header or drum l6 having a stay l5. Stay bolts are indicated at 3. This framework is enclosed by two steel end plates I! cut to fit the triangular frame, thus forming a flattened tube for water space. Within the upper combustion chamber, a series of U-shaped water tubes connect with the inner shell of the vertical leg. Access to the tubes 5 is gained by removal of hand hole plates 1.

A series of flues or fire tubes 2 pass through the bottom inclined leg. Another flue ll] passes through the lower portion of the upper inclined leg. Combination fire and gas escape tubes 9 pass through the upper portion of the upper inclined leg at the inner base of the steam header. Another flue ll passes through the neck, immediately below the steam drum, providing an exit for the gases into the smoke box 8.

A sheet metal casing 14 with insulation l3 encloses the top half and the sides of the boiler. Both the sides and the top casing [4 are removable for accessibility for cleaning and/or repair.

The high point of the water level is on a line parallel with the extreme height of the upper inclined leg. The extreme low level is at the extreme height of the upper inclined leg of the U shaped tubes 5.

The fire is created in the lower combustion chamber 18, immediately heating the lower inclined surface. The fire and combustion gases pass through the fire flues 2, and into the upper combustion chamber. The fire and hot gases heat the upper portion of the lower inclined leg, circulate around baffies l9 in the direction of the arrows 20, thereby heating the nest of U tubes, and the lower surface of the upper in- 3 Claims. (CI. 3.222.79)

clined legs of the U-shaped tubes 5. "Theme and ::hot gases then pass through the fines ,9 and l ll, and circulate .in the chamber immediately beneath the top casing 14. The final passage -01 ithe liotgases is through theflue II, and then out-into the smoke box 8.

We do not limit ourinvention to the strict We fully realize that with the tubes 5, and the flattened tube 6, greater efficiency can be gained.

We are aware that prior to our invention steam generators and water heaters have been made using fire and water tubes. We therefore do not claim such a combination broadly; but we claim:

1. A furnace including a firebox and a boiler comprising, a pair of plates spaced parallel to each other and formed into a triangular framework, the short wall of the triangle being disposed vertically and forming an exterior wall of said Iurnace, said framework being mounted immediately above said firebox, a pair of end plates shaped to fit the ends of said framework thereby forming a flattened tube for water space, a steam header adjacent and connected to said flattened tube at the top of said short leg, a plurality of substantially U-shaped tubes disposed within the triangle of said framework and without the tube, the legs of said U tubes communicating with said vertical leg of said flattened tube near the top and the bottom thereof, a first plurality of flues, connecting the outside of said triangle with the inside thereof, disposed at substantially the bottom of said triangle, near said vertical leg, a first, relatively large, flue thru the top wall of said triangle remote from said vertical leg, a second plurality of flues passing thru said top wall near said vertical leg and smaller in total cross-sectional area than said first flue so that a greater amount of hot gases escape thru said first flue than thru said second flues, and a second relatively larger flue passing thru the junction of said vertical leg and said header.

2. A furnace including a firebox and a boiler comprising a pair of plates spaced parallel to each other and formed into a triangular framework, the short wall of the triangle being disposed vertically and forming an exterior wall of said furnace, a pair of end plates shaped to fit the ends of said framrework thereby forming a flattened tube for water space, a steam header adjacent and connected to said flattened tube at the top of said short leg, a plurality of substantially U-shaped tubes disposed within the triangle of said framework and without the tube, the legs of said U tubes communicating with said vertical leg of said flattened tube near the top and the bottom thereof, a first plurality of flues, connecting the outside of said triangle with the inside thereof, disposed at substantially the bottom of said triangle nearsaid vertical leg, a first, relatively larger, flue thru the top wall of said triangle remote from said vertical leg,

a. second plurality of flues passing thru said top each other and formed into a triangular framefwork, the short wall of the triangle being disposed vertically and forming an exterior wall of said furnace, a pair of end plates shaped to flt the ends of said framework thereby forming a flattened tube for water space, a steam header adjacent and connected to said flattened tube at the top of said short leg, a first plurality of flues, connecting the outside of said triangle with the inside thereof, disposed at substantially the bottom of said triangle near said vertical leg, a first, relatively larger, flue thru the top wall of said triangle remote from said vertical leg, a second plurality of flues passing thru said top wall near said vertical leg and smaller in total cross-sectional area than said first flue so that a greater amount of hot gases escape thru said first flue than thru said second flues, and a second relatively larger flue passing thru the junction of said vertical leg and said header.

ALFRED A. DRAGO. GEORGE H. BRACE.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 153,833 Kilgore Aug. 4, 1874 1,089,747 Butler Mar. 10, 1914 1,342,606 Stanley June 8, 1920 1,770,217 Olson July 8, 1930 FOREIGN PATENTS Number Country Date 3,911 Great Britain Feb. 16, 1904 21,746 Great Britain Oct. 1, 1896 36,272 Germany July 21, 1886 

